Cat tree



FIG. 1 is a perspective view of a cat tree showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The crisscross pattern of lines in the drawings represent material that is understood to be distributed uniformly over the surface of the cat tree attachment in FIGS. 1-5. 

CLAIM The ornamental design for a cat tree, as shown and described. 